The "problem" is that with the advent of email, people simply don't send snail mail at nearly the rate they used to. A Democratic Congress might look at this problem and decide it's essential that the US Government intervene and prop up the Post Office's shrinking and outmoded business model. Hopefully a Republican Congress won't make that mistake.
Parting thought: Didn't President Obama cite the US Postal Service as a positive example of how to strike a happy balance between the public and private sectors during his Obamacare push? Yeah, he did.